diff --git a/ChangeLog b/ChangeLog
index 3d55961f57..0dd6874aa9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Sun Jul 22 21:16:43 2001  Akinori MUSHA  <knu@iDaemons.org>
+
+	* ext/extmk.rb.in, lib/mkmf.rb: introduce a couple of new make
+	  variables: CLEANFILES and DISTCLEANFILES.  They'd typically be
+	  defined in a file "depend".
+
 Fri Jul 20 22:55:01 2001  Akinori MUSHA  <knu@iDaemons.org>
 
 	* gc.c (ruby_xrealloc): fix a dangling bug which led memory
diff --git a/ext/extmk.rb.in b/ext/extmk.rb.in
index 99ad86d979..cb503bdcdd 100644
--- a/ext/extmk.rb.in
+++ b/ext/extmk.rb.in
@@ -480,11 +480,11 @@ EXEEXT = @EXEEXT@
 all:		$(DLLIB)
 
 clean:;		@$(RM) *.#{$OBJEXT} *.so *.sl *.#{$LIBEXT} $(DLLIB)
-		@$(RM) *.ilk *.exp *.pdb *.bak
+		@$(RM) *.ilk *.exp *.pdb *.bak $(CLEANFILES)
 
 distclean:	clean
 		@$(RM) Makefile extconf.h conftest.*
-		@$(RM) core ruby$(EXEEXT) *~
+		@$(RM) core ruby$(EXEEXT) *~ $(DISTCLEANFILES)
 
 realclean:	distclean
 EOS
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index d33045ddb4..4c375a8845 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -476,11 +476,11 @@ EXEEXT = #{CONFIG["EXEEXT"]}
 all:		$(DLLIB)
 
 clean:;		@$(RM) *.#{$OBJEXT} *.so *.sl *.a $(DLLIB)
-		@$(RM) $(TARGET).lib $(TARGET).exp $(TARGET).ilk *.pdb
+		@$(RM) $(TARGET).lib $(TARGET).exp $(TARGET).ilk *.pdb $(CLEANFILES)
 
 distclean:	clean
 		@$(RM) Makefile extconf.h conftest.* mkmf.log
-		@$(RM) core ruby$(EXEEXT) *~
+		@$(RM) core ruby$(EXEEXT) *~ $(DISTCLEANFILES)
 
 realclean:	distclean